Enpirion
®
Power Evaluation Board User Guide
EN6337QI/EN6347QI PowerSoC
Test Recommendations
Recommendations
To guarantee measurement accuracy, the following precautions should be observed:
1. Make all input and output voltage measurements at the board using the test
points provided (TP8 to TP11). This will eliminate voltage drop across the line
and load cables that can produce false readings.
2. Measure input and output current with series ammeters or accurate shunt
resistors. This is especially important when measuring efficiency.
3. Use a low-loop-inductance scope probe tip shown below to measure
switching signals and input / output ripple to avoid noise coupling into the
probe ground lead. Input ripple, output ripple, and load transient deviation are
best measured near the respective input / output capacitors. For more
accurate ripple measurement, please see Enpirion App Note regarding this
subject.
4. The board includes a pull-up resistor for the POK signal and ready to monitor
the power OK status at clip lead marked POK.
5. A 15nF soft-start capacitor is populated on the board for ~1msec soft-start
time.
6. The over-current protection circuit typically limits the maximum load current to
approximately 1.5X the rated value.
Input and Output Capacitors
Please refer to the BOM section for the value of input caps and output caps used on this
evaluation board, which is the result of combination for better performance and smaller
footprints.
NOTE: Capacitors must be X5R or X7R dielectric formulations to ensure adequate
capacitance over operating voltage and temperature ranges.
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